One ESP32 is in APSTA mode
- AP to other ESP32
- STA to keep it connecting it to the internet
This worked fine after testing it
The mosquitto config file is as follows:-
listener 1883
allow_anonymous true
And on the other, I am trying to use the example from esp-idf protocol/MQTT/tcp
In idf.py menuconfig :-
- I changed the username and password (ESP32 connection to AP is not an issue reason being I tested the
wifi/getting_started/stationand it worked fine) - Default broker URL
mqtt://mqtt.eclipseprojects.io
then after erasing flash using esptool.py --port /dev/ttyUSB0 erase_flash
After build I uploaded the code to ESP32 using
idf.py build
idf.py -p /dev/ttyUSB0 flash
And when I monitor it
idf.py -p /dev/ttyUSB0 monitor
It showed the following error
E (562605) esp-tls: couldn't get hostname for :mqtt.eclipseprojects.io: getaddrinfo() returns 202, addrinfo=0x0
E (562605) transport_base: Failed to open a new connection: 32769
E (562605) mqtt_client: Error transport connect
I (562615) MQTT_EXAMPLE: MQTT_EVENT_ERROR
E (562615) MQTT_EXAMPLE: Last error reported from esp-tls: 0x8001
I (562625) MQTT_EXAMPLE: Last errno string (Success)
I (562625) MQTT_EXAMPLE: MQTT_EVENT_DISCONNECTED
I (572635) MQTT_EXAMPLE: Other event id:7
Here is the protocol/MQTT/tcp code that I mentioned in question and APSTA-code as mentioned in question
APSTA main code file
/* The example of ESP-IDF
*
* This sample code is in the public domain.
*/
#include <string.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/event_groups.h"
#include "esp_system.h"
#include "esp_wifi.h"
#include "esp_event.h"
#include "esp_log.h"
#include "nvs_flash.h"
static const char *TAG = "MAIN";
static EventGroupHandle_t wifi_event_group;
const int CONNECTED_BIT = BIT0;
static void event_handler(void* arg, esp_event_base_t event_base,
int32_t event_id, void* event_data)
{
if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_STA_DISCONNECTED) {
ESP_LOGI(TAG, "WIFI_EVENT_STA_DISCONNECTED");
esp_wifi_connect();
xEventGroupClearBits(wifi_event_group, CONNECTED_BIT);
} else if (event_base == IP_EVENT && event_id == IP_EVENT_STA_GOT_IP) {
ESP_LOGI(TAG, "IP_EVENT_STA_GOT_IP");
xEventGroupSetBits(wifi_event_group, CONNECTED_BIT);
}
}
static void initialise_wifi(void)
{
esp_log_level_set("wifi", ESP_LOG_WARN);
static bool initialized = false;
if (initialized) {
return;
}
ESP_ERROR_CHECK(esp_netif_init());
wifi_event_group = xEventGroupCreate();
ESP_ERROR_CHECK(esp_event_loop_create_default());
esp_netif_t *ap_netif = esp_netif_create_default_wifi_ap();
assert(ap_netif);
esp_netif_t *sta_netif = esp_netif_create_default_wifi_sta();
assert(sta_netif);
wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
ESP_ERROR_CHECK( esp_wifi_init(&cfg) );
ESP_ERROR_CHECK( esp_event_handler_register(WIFI_EVENT, WIFI_EVENT_STA_DISCONNECTED, &event_handler, NULL) );
ESP_ERROR_CHECK( esp_event_handler_register(IP_EVENT, IP_EVENT_STA_GOT_IP, &event_handler, NULL) );
ESP_ERROR_CHECK( esp_wifi_set_storage(WIFI_STORAGE_RAM) );
ESP_ERROR_CHECK( esp_wifi_set_mode(WIFI_MODE_NULL) );
ESP_ERROR_CHECK( esp_wifi_start() );
initialized = true;
}
#if CONFIG_WIFI_CONNECT_AP
static bool wifi_ap(void)
{
wifi_config_t wifi_config = { 0 };
strcpy((char *)wifi_config.ap.ssid,CONFIG_AP_WIFI_SSID);
strcpy((char *)wifi_config.ap.password, CONFIG_AP_WIFI_PASSWORD);
wifi_config.ap.authmode = WIFI_AUTH_WPA_WPA2_PSK;
wifi_config.ap.ssid_len = strlen(CONFIG_AP_WIFI_SSID);
wifi_config.ap.max_connection = CONFIG_AP_MAX_STA_CONN;
wifi_config.ap.channel = CONFIG_AP_WIFI_CHANNEL;
if (strlen(CONFIG_AP_WIFI_PASSWORD) == 0) {
wifi_config.ap.authmode = WIFI_AUTH_OPEN;
}
ESP_ERROR_CHECK( esp_wifi_set_mode(WIFI_MODE_AP) );
ESP_ERROR_CHECK( esp_wifi_set_config(ESP_IF_WIFI_AP, &wifi_config) );
ESP_ERROR_CHECK( esp_wifi_start() );
ESP_LOGI(TAG, "WIFI_MODE_AP started. SSID:%s password:%s channel:%d",
CONFIG_AP_WIFI_SSID, CONFIG_AP_WIFI_PASSWORD, CONFIG_AP_WIFI_CHANNEL);
return ESP_OK;
}
#endif
#if CONFIG_WIFI_CONNECT_STA
static bool wifi_sta(int timeout_ms)
{
wifi_config_t wifi_config = { 0 };
strcpy((char *)wifi_config.sta.ssid, CONFIG_STA_WIFI_SSID);
strcpy((char *)wifi_config.sta.password, CONFIG_STA_WIFI_PASSWORD);
ESP_ERROR_CHECK( esp_wifi_set_mode(WIFI_MODE_STA) );
ESP_ERROR_CHECK( esp_wifi_set_config(ESP_IF_WIFI_STA, &wifi_config) );
ESP_ERROR_CHECK( esp_wifi_connect() );
int bits = xEventGroupWaitBits(wifi_event_group, CONNECTED_BIT,
pdFALSE, pdTRUE, timeout_ms / portTICK_PERIOD_MS);
ESP_LOGI(TAG, "bits=%x", bits);
if (bits) {
ESP_LOGI(TAG, "WIFI_MODE_STA connected. SSID:%s password:%s",
CONFIG_STA_WIFI_SSID, CONFIG_STA_WIFI_PASSWORD);
} else {
ESP_LOGI(TAG, "WIFI_MODE_STA can't connected. SSID:%s password:%s",
CONFIG_STA_WIFI_SSID, CONFIG_STA_WIFI_PASSWORD);
}
return (bits & CONNECTED_BIT) != 0;
}
#endif
#if CONFIG_WIFI_CONNECT_APSTA
static bool wifi_apsta(int timeout_ms)
{
wifi_config_t ap_config = { 0 };
strcpy((char *)ap_config.ap.ssid,CONFIG_AP_WIFI_SSID);
strcpy((char *)ap_config.ap.password, CONFIG_AP_WIFI_PASSWORD);
ap_config.ap.authmode = WIFI_AUTH_WPA_WPA2_PSK;
ap_config.ap.ssid_len = strlen(CONFIG_AP_WIFI_SSID);
ap_config.ap.max_connection = CONFIG_AP_MAX_STA_CONN;
ap_config.ap.channel = CONFIG_AP_WIFI_CHANNEL;
if (strlen(CONFIG_AP_WIFI_PASSWORD) == 0) {
ap_config.ap.authmode = WIFI_AUTH_OPEN;
}
wifi_config_t sta_config = { 0 };
strcpy((char *)sta_config.sta.ssid, CONFIG_STA_WIFI_SSID);
strcpy((char *)sta_config.sta.password, CONFIG_STA_WIFI_PASSWORD);
ESP_ERROR_CHECK( esp_wifi_set_mode(WIFI_MODE_APSTA) );
ESP_ERROR_CHECK( esp_wifi_set_config(ESP_IF_WIFI_AP, &ap_config) );
ESP_ERROR_CHECK( esp_wifi_set_config(ESP_IF_WIFI_STA, &sta_config) );
ESP_ERROR_CHECK( esp_wifi_start() );
ESP_LOGI(TAG, "WIFI_MODE_AP started. SSID:%s password:%s channel:%d",
CONFIG_AP_WIFI_SSID, CONFIG_AP_WIFI_PASSWORD, CONFIG_AP_WIFI_CHANNEL);
ESP_ERROR_CHECK( esp_wifi_connect() );
int bits = xEventGroupWaitBits(wifi_event_group, CONNECTED_BIT,
pdFALSE, pdTRUE, timeout_ms / portTICK_PERIOD_MS);
ESP_LOGI(TAG, "bits=%x", bits);
if (bits) {
ESP_LOGI(TAG, "WIFI_MODE_STA connected. SSID:%s password:%s",
CONFIG_STA_WIFI_SSID, CONFIG_STA_WIFI_PASSWORD);
} else {
ESP_LOGI(TAG, "WIFI_MODE_STA can't connected. SSID:%s password:%s",
CONFIG_STA_WIFI_SSID, CONFIG_STA_WIFI_PASSWORD);
}
return (bits & CONNECTED_BIT) != 0;
}
#endif
void app_main()
{
esp_err_t err = nvs_flash_init();
if (err == ESP_ERR_NVS_NO_FREE_PAGES || err == ESP_ERR_NVS_NEW_VERSION_FOUND) {
ESP_ERROR_CHECK( nvs_flash_erase() );
err = nvs_flash_init();
}
ESP_ERROR_CHECK(err);
initialise_wifi();
#if CONFIG_WIFI_CONNECT_AP
ESP_LOGW(TAG, "Start AP Mode");
wifi_ap();
#elif CONFIG_WIFI_CONNECT_STA
ESP_LOGW(TAG, "Start STA Mode");
wifi_sta(CONFIG_STA_CONNECT_TIMEOUT*1000);
#elif CONFIG_WIFI_CONNECT_APSTA
ESP_LOGW(TAG, "Start APSTA Mode");
wifi_apsta(CONFIG_STA_CONNECT_TIMEOUT*1000);
#endif
}
protocal/mqtt/tcp code
/* MQTT (over TCP) Example
This example code is in the Public Domain (or CC0 licensed, at your option.)
Unless required by applicable law or agreed to in writing, this
software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
CONDITIONS OF ANY KIND, either express or implied.
*/
#include <stdio.h>
#include <stdint.h>
#include <stddef.h>
#include <string.h>
#include "esp_wifi.h"
#include "esp_system.h"
#include "nvs_flash.h"
#include "esp_event.h"
#include "esp_netif.h"
#include "protocol_examples_common.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/semphr.h"
#include "freertos/queue.h"
#include "lwip/sockets.h"
#include "lwip/dns.h"
#include "lwip/netdb.h"
#include "esp_log.h"
#include "mqtt_client.h"
static const char *TAG = "MQTT_EXAMPLE";
static void log_error_if_nonzero(const char *message, int error_code)
{
if (error_code != 0) {
ESP_LOGE(TAG, "Last error %s: 0x%x", message, error_code);
}
}
/*
* @brief Event handler registered to receive MQTT events
*
* This function is called by the MQTT client event loop.
*
* @param handler_args user data registered to the event.
* @param base Event base for the handler(always MQTT Base in this example).
* @param event_id The id for the received event.
* @param event_data The data for the event, esp_mqtt_event_handle_t.
*/
static void mqtt_event_handler(void *handler_args, esp_event_base_t base, int32_t event_id, void *event_data)
{
ESP_LOGD(TAG, "Event dispatched from event loop base=%s, event_id=%d", base, event_id);
esp_mqtt_event_handle_t event = event_data;
esp_mqtt_client_handle_t client = event->client;
int msg_id;
switch ((esp_mqtt_event_id_t)event_id) {
case MQTT_EVENT_CONNECTED:
ESP_LOGI(TAG, "MQTT_EVENT_CONNECTED");
msg_id = esp_mqtt_client_publish(client, "/topic/qos1", "data_3", 0, 1, 0);
ESP_LOGI(TAG, "sent publish successful, msg_id=%d", msg_id);
msg_id = esp_mqtt_client_subscribe(client, "/topic/qos0", 0);
ESP_LOGI(TAG, "sent subscribe successful, msg_id=%d", msg_id);
msg_id = esp_mqtt_client_subscribe(client, "/topic/qos1", 1);
ESP_LOGI(TAG, "sent subscribe successful, msg_id=%d", msg_id);
msg_id = esp_mqtt_client_unsubscribe(client, "/topic/qos1");
ESP_LOGI(TAG, "sent unsubscribe successful, msg_id=%d", msg_id);
break;
case MQTT_EVENT_DISCONNECTED:
ESP_LOGI(TAG, "MQTT_EVENT_DISCONNECTED");
break;
case MQTT_EVENT_SUBSCRIBED:
ESP_LOGI(TAG, "MQTT_EVENT_SUBSCRIBED, msg_id=%d", event->msg_id);
msg_id = esp_mqtt_client_publish(client, "/topic/qos0", "data", 0, 0, 0);
ESP_LOGI(TAG, "sent publish successful, msg_id=%d", msg_id);
break;
case MQTT_EVENT_UNSUBSCRIBED:
ESP_LOGI(TAG, "MQTT_EVENT_UNSUBSCRIBED, msg_id=%d", event->msg_id);
break;
case MQTT_EVENT_PUBLISHED:
ESP_LOGI(TAG, "MQTT_EVENT_PUBLISHED, msg_id=%d", event->msg_id);
break;
case MQTT_EVENT_DATA:
ESP_LOGI(TAG, "MQTT_EVENT_DATA");
printf("TOPIC=%.*s\r\n", event->topic_len, event->topic);
printf("DATA=%.*s\r\n", event->data_len, event->data);
break;
case MQTT_EVENT_ERROR:
ESP_LOGI(TAG, "MQTT_EVENT_ERROR");
if (event->error_handle->error_type == MQTT_ERROR_TYPE_TCP_TRANSPORT) {
log_error_if_nonzero("reported from esp-tls", event->error_handle->esp_tls_last_esp_err);
log_error_if_nonzero("reported from tls stack", event->error_handle->esp_tls_stack_err);
log_error_if_nonzero("captured as transport's socket errno", event->error_handle->esp_transport_sock_errno);
ESP_LOGI(TAG, "Last errno string (%s)", strerror(event->error_handle->esp_transport_sock_errno));
}
break;
default:
ESP_LOGI(TAG, "Other event id:%d", event->event_id);
break;
}
}
static void mqtt_app_start(void)
{
esp_mqtt_client_config_t mqtt_cfg = {
.broker.address.uri = CONFIG_BROKER_URL,
};
#if CONFIG_BROKER_URL_FROM_STDIN
char line[128];
if (strcmp(mqtt_cfg.broker.address.uri, "FROM_STDIN") == 0) {
int count = 0;
printf("Please enter url of mqtt broker\n");
while (count < 128) {
int c = fgetc(stdin);
if (c == '\n') {
line[count] = '\0';
break;
} else if (c > 0 && c < 127) {
line[count] = c;
++count;
}
vTaskDelay(10 / portTICK_PERIOD_MS);
}
mqtt_cfg.broker.address.uri = line;
printf("Broker url: %s\n", line);
} else {
ESP_LOGE(TAG, "Configuration mismatch: wrong broker url");
abort();
}
#endif /* CONFIG_BROKER_URL_FROM_STDIN */
esp_mqtt_client_handle_t client = esp_mqtt_client_init(&mqtt_cfg);
/* The last argument may be used to pass data to the event handler, in this example mqtt_event_handler */
esp_mqtt_client_register_event(client, ESP_EVENT_ANY_ID, mqtt_event_handler, NULL);
esp_mqtt_client_start(client);
}
void app_main(void)
{
ESP_LOGI(TAG, "[APP] Startup..");
ESP_LOGI(TAG, "[APP] Free memory: %d bytes", esp_get_free_heap_size());
ESP_LOGI(TAG, "[APP] IDF version: %s", esp_get_idf_version());
esp_log_level_set("*", ESP_LOG_INFO);
esp_log_level_set("mqtt_client", ESP_LOG_VERBOSE);
esp_log_level_set("MQTT_EXAMPLE", ESP_LOG_VERBOSE);
esp_log_level_set("TRANSPORT_BASE", ESP_LOG_VERBOSE);
esp_log_level_set("esp-tls", ESP_LOG_VERBOSE);
esp_log_level_set("TRANSPORT", ESP_LOG_VERBOSE);
esp_log_level_set("outbox", ESP_LOG_VERBOSE);
ESP_ERROR_CHECK(nvs_flash_init());
ESP_ERROR_CHECK(esp_netif_init());
ESP_ERROR_CHECK(esp_event_loop_create_default());
/* This helper function configures Wi-Fi or Ethernet, as selected in menuconfig.
* Read "Establishing Wi-Fi or Ethernet Connection" section in
* examples/protocols/README.md for more information about this function.
*/
ESP_ERROR_CHECK(example_connect());
mqtt_app_start();
}
